Lets meet in optics part today with compact standard photo-lens Sony SEL-20F28 for Sony E mounts. Its 20 mm focus is fixed, diaphragm can be set in f/2.8 – f/16 range ( it is relatively light lens ) with use of 7 diaphragm blades. It is designed for APS-C sensors and gives 70 degrees field of view with them, minimal focusing distance is 0.2 m, it does not support automatic focusing and optical image stabilization ( which camera can perform by itself via sensor shifting, if it supports such function ). 6 lens elements in 6 groups are built into it, among them 3 are aspherical for chromatic and geometric distortions reduction, they all are coated with protective and anti-reflective multi-coating. 49 mm optical filters can be attached to it, its sizes are 62.6 ( diameter ) x 20.4 ( length ) mm, and mass is 69 g.
Package contains : Sony SEL-20F28 photo-lens itself, frontal and rear caps, protective and carrying case and user’s guide. All in all, this is a good fixed photo-lens with small glasses amount, aspherical lens elements, relatively high light strength and big field of view; it is more oriented to photos making, because it does not support automatic focusing and optical image stabilization ( which camera can perform by itself, if it supports it ), but experienced photographers can use it for videos recording also.
